Mine jack



Aug. 8, 1933.

o SANN MINE JACK -Filed Aug. 7, 1931 INVENTOR OTToJA/wv.

BY ms ATTORNEYS Patented Aug.y8, 1933 v V n e p UNITED STATES PATENTo icEf 1,921,542 MINE JAcK Otto Sann, Jolmstown, Pa. Application August 7, 1931. Serial o. 555,812 g Claims. 7 (c1. 254 1o4) 'I This invention relates to improvements in mine similarly shaped grooves .-3 0 formed 11115115 jacks and aims to provide'a simple and durable member12. l. V f, 5 device of this character which can be ruggedly A latch member 32 is loosely, pivoted on a stud constructed and manufactured inexpensively. 34 whichissupported in suitable bearing lugs- 36,

5 One object of the invention is to provide amine extending inwardlyfrom the interiorof the memjack of a minimum number of parts. This is berl2. The latchis formedwithatooth 38 whicli, desirable because the tool is handled by relawhen the jack is in its locked position, engages the tively unskilled labor, not particularly trained inclined face 40 0f; ani abutment 42 extending in-1 in assembling coacting parts of mechanical de Warclly from the'mernber l0. p i 3 10 vices. Moreover, frequently with the types of An opening 44 is formed in the member 12 of 5 jacks heretofore employed having many elethe jack and the tail 48 of the latch extends ments, some of the parts are easily lost or misthrough this opening. The height of the slot 44 placed, in which case the device is either pracis such that its upper and lower edges, respectively,

tically inoperative or substitute parts of a make- 50 and 52 serve as stops to limit the rocking move- 15 shift character are substituted to less effectively ment of the latch. When in working position, the

take the place of lost parts. This is a dangertail of the latch strikes theshoulder 52 and the ous procedure where the jack is used to shore tooth 38 is thus accurately positioned for engageup or support the roof of a mine or other heavy ment with the abutment 42. In order to release mass. Failure of the parts is apt to result in loss the latch so as to separate the complementary 20 of life or damage to machinery used in mining parts of the jack, the tail 48 is struck from below operations. by means of a sledge or other tool, thus turning My improved jack consists solely of two main the latch to the-position of Fig. 2, the angular coacting parts of rugged construction which are movement of the latch being limited at this time parted on an inclined plane, one part being by the tail striking the upper surface 50 of the adapted to ride upon wedge-like faces of the slot. If desired, themembers 10 and 12 may be other and the device having a locking latch for provided with suitable handles such as indicated releasably holding the two parts in supporting at 54 and 56. These may be formed of ordinary position. bar stock cast in place or alternately they may be One embodiment of the invention is illustrated cast integrally.

30 in the accompanying drawing wherein; It will be readily understood that in order to en- Fig. 1 is a side elevation of the jack in working gage the jack with a roof or other overhead device position with a portion brokenaway; to be supported, the member 10 will be placed in Fig. 2 is a central longitudinal section through the desired position, then the member 12 will be the 'jack showing the complementary parts in reengaged therewith, the slots 30 thereof being posi- 1 35 leased position; tioned for coaction with the ribs 28. The part 12 Fig. 3 is a detailed elevation of a portion is then pushed along the inclined surface 26, a of the jack viewed from the right side of Fig. 1; sledge hammer or other tool being used if required. Fig. 4 is a horizontal section on line 4-4 of Up n a e the position of F 1, t latch Fig. 1. will drop into locked position by gravity and the 40 R f i in detail to the dlawing, the jack is then in its normal operative position. To

proved jack consists of two complementary release the parts, it is merely necessary to strike tions 10 and 12 having respective base and head h latch from below and then tap e P portions 14 and 16 formed integral with the wlth a m as to cans? It nae hollow column sections 18 and 20. Strengthengig g i g 1331 & %g g; be 6 mg nbs 22 i g l from the b 142mm The improved device, as above described, isexf-,

cap 16, respec ively, into the column sections tremely simple in construction and operation, it

as shown 1 contains no parts which are apt to be lost or mis- The complementary members and 12 are placed and it is practically foolproof in operation.

50 parted on a diagonal or oblique plane, as indicated Various Changes in arrangement and u t ur 1n Fi s. 1 a d a T p ve t t pa m tion of equivalents may be made by those skilled mn rela iv ly to one an and also to prop in the art without departing from the invention erly align them for proper interengagement, the as defined in the appended claims. member 10 is provided with upwardly extending What I claim is:-

55 ribs or projections 28-28 which slidingly engage 1 jack comprising two complementary and hollow post members having respective base and cap portions and parted in a plane inclined with respect to said base and cap portions, a latch pivotally mounted interiorly in one of said members and having 'a portion thereof adapted for engagement with an internal abutment on the other member. I

2. A mine jack consisting solely of two hollow post members having coacting inclined portions, and a releasably movable latch internally disposed in one of the members having a portion for engagement with an internally disposed abutment on the other member and means for limiting the movement of said latch member.

3. A mine jack comprising two hollow post members parted on a plane inclined with respect to the longitudinal axis of saidmembers, a projection disposed upon the inclined section on one member and a coacting groove recessedin the inclined section of the other member, an internally disposed pivoted latch carried by one member, an internally disposed abutment for cooperation therewith carried by the other member, and means limiting the pivotal movement of said latch. g

4'. "A mine jack comprising a lower hollow post member having a substantially horizontal base, an upper hollow post member having a substantially horizontal cap, the upper part of the lower member and the lower part of the upper member having coacting portions inclined with respect to said base and cap portions, an abutment formed in the inclined section of the lower member, an internally disposed latch pivoted to the upper member and having a tooth for coaction with said abutment, said latch having a tail and said upper member having a slot through which the tail projects, the length of the slot being proportioned to limit movement of said latch.

5. A mine jack of the character described comprising a lower hollow post member having a substantially horizontal base, an upper hollow post member having a substantially horizontal cap,

the upper part of the lower member and the. lower part of the upper member having coacting portions inclined with respect to said base and cap portions, a projection disposed upon the inclined plane section of one member and a coacting groove recessed in the inclined section of the other member, an abutment formed in the inclined section of the lower member, an internally disposed latch pivoted to the upper member and having atooth for coaction with said abutment, said latch having a tail andsaid upper member having a slot through which the tail projects, the length of the slot being propor tioned to limit movement of saidlatch.

- OTTO SANN. 

